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参数资料
| 型号： | TC1240ECH |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 125 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | SOT-23A, 6 PIN |
| 文件页数： | 13/16页 |
| 文件大小： | 472K |
| 代理商： | TC1240ECH |
TC1240/TC1240A
DS21516B-page 6
2002 Microchip Technology Inc.
The pump frequency in Equation 4-1(b) is defined as
one-half the oscillator frequency (i.e., fFSW =FOSC/2).
The 1/(fFSW)(C1) term in Equation 4-1(b) is the
effective output resistance of an ideal switched
capacitor circuit (Figure 4-1 and Figure 4-2).
The remaining losses in the circuit are due to factor (4)
above, and are shown in Equation 4-2. The output
voltage ripple is given by Equation 4-3.
EQUATION 4-2:
EQUATION 4-3:
FIGURE 4-1:
IDEAL SWITCHED
CAPACITOR MODEL
FIGURE 4-2:
EQUIVALENT OUTPUT
RESISTANCE
4.3
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1 will
lower the output resistance and larger values of C2 will
reduce output ripple. (See Equation 4-1(b)).
Table 4-1 shows various values of C1 and the
corresponding output resistance values @ +25°C. It
assumes a 0.1
ESRC1 and 0.9 RSW. Table 4-2
shows the output voltage ripple for various values of
C2. The VRIPPLE values assume 5mA output load
current and 0.1
ESRC2.
TABLE 4-1:
OUTPUT RESISTANCE
VS. C1 (ESR = 0.1
)
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE
VS. C2 (ESR = 0.1
)IOUT 5mA
PLOSS(4) = [(0.5)(C1)(VIN
2 –V
OUT
2)+ (0.5)
(C2)(VRIPPLE
2 –2V
OUT VRIPPLE)] xfOSC
VRIPPLE =[ IOUT /2 x ( fOSC)(C2)] + 2 ( IOUT) (ESRC2)
V+
VOUT
RL
C2
C1
f
V+
VOUT
REQUIV
REQUIV =
RL
C2
f x C1
1
C1 (
F)
TC1240
ROUT()
TC1240A
ROUT()
0.47
47
35
1
28.5
20.5
2.2
19.5
14
3.3
17
12
4.7
15.5
10.5
10
13.6
9.3
47
12.5
8.3
100
12.2
8.1
C1 (
F)
TC1240/TC1240A
VRIPPLE (mV)
0.47
142
167
2.2
30
3.3
20
4.7
14
10
6.7
47
2.5
100
1.6
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相关代理商/技术参数 |
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| TC1240ECHTR | 功能描述:电荷泵 Positive Doubling RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
| TC1240ECHTR-CUT TAPE | 制造商:Microchip 功能描述:TC1240 Series 2.5 to 5.5 V Positive Doubling Charge Pump w/ Shutdown - SOT-23-6 |
| TC1240I/CHTR | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package |
| TC1240ICHTR | 制造商:Microchip Technology Inc 功能描述: |
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